That depends whether you celebrate Pi day on 3.14 (March 14) or 22/7 (July 22).
The day of the week was a Saturday.
22 June 1975 was a Sunday.
25 October 1975 was a Saturday.
June 13, 1975 was a Friday.
22 October 1975 was a Wednesday.
25 July 1975 was a Friday.
17 September 1975 was a Wednesday.
28 February 1975 was a Friday.
21 February 1975 was a Friday.
20 October 1975 was a Monday.
June 2 1975 was a Monday.
June 1 1975 was on a Sunday.